Pressure sensor having a sealed water-resistant construction
First Claim
1. A pressure sensor comprising:
- a housing having an opening;
a pressure sensing element disposed in said housing and having a pressure intake;
a pressure guide having a pressure path and a flange, the flange being fitted to said opening of said housing with an end of the pressure path being connected to said intake of said sensing element; and
a wiring board interposed between said sensing element and said flange of said pressure guide,wherein said pressure path of said pressure guide and said intake of said pressure sensing element are connected to each other and penetrate through said wiring board to form a pressure passage and a clearance is formed between said wiring board and said flange of said pressure guide, said clearance being filled with potting material and terminals of said pressure sensing element are provided on a side of said pressure sensing element where said intake is disposed.
1 Assignment
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Accused Products
Abstract
A pressure sensor has a housing (1). The housing accommodates a pressure sensing element (2) and a wiring board (3). The wiring board incorporates a lead irame (14). The lead frame connects output terminals (21) of the sensing element with ends of connector pins (12). A pressure guide (4) has a pressure path (41) and a flange (44). The flange is inserted in an opening of the housing with the pressure path being airtightly connected to a pressure intake (22) extending from the sensing element and with an end face (4a) of the flange being spaced apart from the wiring board. Potting material (5) coats the sensing element, the wiring board, and the flange of the pressure guide in the housing. If the potting material peels off the flange, water may penetrate the peeled part and reach the end face of the flange. The water, however, never reaches the wiring board because the end face of the flange is spaced apart from the wiring board. Accordingly, the lead frame in the wiring board is free from water and no migration is caused.
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Citations
16 Claims
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1. A pressure sensor comprising:
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a housing having an opening; a pressure sensing element disposed in said housing and having a pressure intake; a pressure guide having a pressure path and a flange, the flange being fitted to said opening of said housing with an end of the pressure path being connected to said intake of said sensing element; and a wiring board interposed between said sensing element and said flange of said pressure guide, wherein said pressure path of said pressure guide and said intake of said pressure sensing element are connected to each other and penetrate through said wiring board to form a pressure passage and a clearance is formed between said wiring board and said flange of said pressure guide, said clearance being filled with potting material and terminals of said pressure sensing element are provided on a side of said pressure sensing element where said intake is disposed. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A pressure sensor, comprising:
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a housing having an opening; a pressure sensing element disposed in the housing and having a pressure intake; a pressure guide having a pressure path and a flange, the flange being fitted to the opening of the housing with an end of the pressure path being airtightly connected to the intake of the sensing element; potting material injected in the housing; through holes formed on the periphery of the flange of the pressure guide; and a tapered end face of the flange of the pressure guide facing the sensing element, the tapered end face rising from the through holes toward the connection between the pressure path of the pressure guide and the intake of the sensing element, so that the tapered end face approaches the sensing element. - View Dependent Claims (9, 10, 11)
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12. A pressure sensor comprising:
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a housing having an opening and a side wall, and embedding connector pins passing through the side wall; a pressure sensing element disposed in the housing and having a pressure intake; a wiring board inserted in the opening of the housing and having a lead frame for connecting given output terminals of the sensing element with ends of corresponding connector pins; a pressure guide having a pressure path and a flange, the flange being fitted to the opening of the housing with an end face of the flange being spaced apart from the wiring board by a predetermined clearance with the pressure path being airtightly connected to the intake that extends from the sensing element through the wiring board; and potting material that fills spaces around the sensing element, wiring board, and the flange of the pressure guide wherein terminals of said pressure sensing elements provided on a side of said pressure sensing element where said intake is disposed. - View Dependent Claims (13)
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14. A pressure sensor comprising:
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a housing having an opening; a pressure sensing element disposed in said housing and having a pressure intake; a pressure guide having a tubular pressure path including a proximal end and a distal end, and a flange section, said flange section being disposed in a portion located inside said housing with respect to said opening; and a wiring board interposed between said sensing element and said flange section of said pressure guide; wherein said flange section is connected to said proximal end of said tubular pressure guide. - View Dependent Claims (15, 16)
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Specification